Cabin of working machine and working machine having cabin

ABSTRACT

A cabin includes: a panel disposed on a side of an operator seat, the panel including: a plurality of cross members extending in a first direction; and a plurality of transverse members intersecting with the plurality of cross members each other and extending in a second direction; a glass panel disposed on a side of the panel; a window frame disposed on the glass panel; a window panel disposed on the window frame, the window panel being configured to move in the first direction or in the second direction; a projecting member disposed on a side of the window panel, the side being an identical side to the operator seat, the projecting member being configured to move together with the window panel; and a guide portion configured to accept insertion of the projecting member and to limit a moving distance of the window panel.

CROSS-REFERENCE TO RELATED APPLICATIONS

The present application is a Divisional application of U.S. applicationSer. No. 14/862,401 filed on Sep. 23, 2015, which claims priority under35 U.S.C. § 119 to Japanese Patent Application No. 2014-202387, filedSep. 30, 2014, to Japanese Patent Application No. 2014-202392, fliedSep. 30, 2014, and to Japanese Patent Application No. 2014-202400, filedSep. 30, 2014. The contents of these applications are incorporatedherein by reference in their entireties.

BACKGROUND OF THE INVENTION Field of the Invention

The present invention relates to a cabin of a working machine, theworking machine having the cabin, and a method for manufacturing thecabin, and especially relates to a cabin of a working machine such as askid steer loader, a track loader, and a compact track loader, theworking machine having the cabin, and a method for manufacturing thecabin.

Description of Related Art

A working machine normally includes a cabin, the working machine beingcalled a loader such as a Skid Steer Loader (SSL), a Track Loader (TL),and a Compact Track Loader (CTL). Japanese Unexamined Patent ApplicationPublication No. 2010-65436 discloses a side structure of a cabin. Theside structure is constituted of a side panel and a glass panel, theside panel having a lattice structure (being a grille) and being coveredwith the glass panel, that is so-called a double-plate structure. Thecabin including the side structure is known.

-   -   The lattice structure (the grille) is formed of: a plurality of        vertically extending strips; and a plurality of horizontally        extending strips. The side panel of the cabin disclosed in        Japanese Unexamined Patent Application Publication No.        2010-65436 employs the lattice structure.

A working machine normally has an air conditioner (an air conditioningmachine) as disclosed, for example, in Japanese Unexamined PatentApplication Publication No. 2004-291695, the working machine including acabin mounted on a body of the working machine, the working machinebeing called a loader such as a Skid Steer Loader (SSL), a Track Loader(TL), and a Compact Track Loader (CTL). The air conditioner cools aninside of the cabin mounted on the body of the working machine. Theworking machine including the air conditioner is known.

-   -   The working machine disclosed in Japanese Unexamined Patent        Application Publication No. 2004-291695 includes an inlet member        on a rear portion of a roof member constituting the cabin so        that the inlet member protrudes backward, the inlet member        having an external air inlet serving as a duct for introducing        the external air. The working machine disposes a filter inside        the inlet member having the external air inlet.

Japanese Unexamined Patent Application Publication No. 2011-207287discloses a cabin of a working machine.

-   -   The cabin includes an operator seat, a frame portion, a roof,        and a front panel. The frame portion is disposed in front of the        operator seat to form an opening for getting on and off the        working machine. The roof is disposed above the operator seat.        The front panel is capable of being moved between a first        position and a second position, the first position being a        position for the front panel to close the opening, the second        position being a position between the operator seat and the        roof.

In the above-mentioned working machine, the front panel is provided witha latch on an upper portion of the front panel, and the frame portion isprovided with a first striker. The latch of the front panel can beengaged to the first striker of the frame portion when the front panelis moved to be set at the first position. And, the roof is provided witha second striker on a rear portion of the roof. The latch of the frontpanel can be engaged to the second striker of the roof when the frontpanel is moved to be set at the second position. The working machine isprovided with a lock member. The lock member is configured to catch acertain position of the front panel, the certain position being oppositeto the latch, thereby holding the front panel.

The lock member is provided on the front panel and is capable of freelymoving in a direction along a width of the front panel. The cabin isprovided with a hold member in a room of the cabin, the hold memberbeing engaged to the lock member to hold the front panel at the secondposition.

-   -   The lock member can be moved toward a right side or a left side        of the cabin when the front panel is moved to be set at the        second position, thereby being engaged to the hold member. The        lock member is continuously pressed by a pressing member toward        a direction in which the lock member is engaged to the hold        member. In addition, the pressing member continuously presses        the lock member to the hole member after the lock member is        engaged to the hold member once. When the lock member engaged to        the hold member is moved from the hold member against the        pressing force of the pressing member, the lock member can slip        out from the hold member.

BRIEF SUMMARY OF THE INVENTION Problems to be Solved by the Invention

In a manufacturing process of the side panel, the press forming molds aplate to form a lattice structure (form a grille plate) at first. Then,the grille plate is assembled on a frame body by the welding or by usingbolts, thereby being integrated with the frame body to form the sidepanel. However, the grille plate and the frame body are separatelyprepared and are is integrated with each other by the assembling. Theside panel accordingly has a limitation on improvement of precision andstrength even when the grille plate has adequate precision and the framebody has adequate precision.

To solve the above mentioned problems, the present invention intends toprovide: a cabin of a working machine, the cabin including a side panelfabricated with high precision and high strength; and a working machinehaving the cabin.

In addition, the above mentioned conventional duct (the external airinlet) is manufactured as a component formed separately from the cabin,and is additionally attached to the cabin. Thus, the cabin has problems,that is, the number of components is large and the number ofmanufacturing processes is large, for example.

To solve the above mentioned problems, the present invention intends toprovide: a cabin of a working machine, the cabin being capable of easilyforming the duct for introducing the external air; and a working machinehaving the cabin.

Furthermore, the lock member is continuously pressed by the pressingmember toward the direction in which the lock member is engaged to thehold member, and protrudes toward the direction along the width of thefront panel (here referred to as a side direction). The lock membermoves together with the front panel moving between the first positionand the second position. When the front panel moves between the firstposition and the second position together with the lock memberprotruding toward the side direction, the lock member will hit somethingarranged in the cabin.

To solve the above mentioned problems, the present invention intends toprovide: a cabin capable of preventing the hitting of the lock member;and a working machine having the cabin.

Means of Solving the Problems

To solve the above-mentioned technical problems, techniques that thepresent invention provides are characterized in the following points.

-   -   A cabin includes: a panel disposed on a side of an operator        seat, the panel including:        -   a plurality of cross members extending in a first direction;        -   a plurality of transverse members intersecting with the            plurality of cross members each other and extending in a            second direction; and        -   a frame member configured to connect between end portions of            the cross members and between end portions of the transverse            members;    -   a glass panel disposed on a side of the panel, the side being        opposite to the operator seat;    -   a window frame disposed on the glass panel;    -   a window panel disposed on the window frame, the window panel        being configured to move in the first direction or in the second        direction;    -   a projecting member disposed on a side of the window panel, the        side being an identical side to the operator seat, the        projecting member being configured to move together with the        window panel in the first direction or in the second direction;        and    -   a guide portion configured to accept insertion of the projecting        member and to limit a moving distance of the window panel, the        guide portion being constituted of the cross members and the        transverse members.

The cabin includes: the window frame disposed on a side of the glasspanel, the side being an identical side to the operator seat;

-   -   the glass panel including:        -   a rim forming an opening in a front portion of the window            frame, and    -   the window panel closing the opening by moving forward in the        window frame, and opening the opening by moving backward in the        window frame.

The cabin includes the guide portion disposed on a positioncorresponding to a rear portion of the panel.

-   -   The cabin includes: a frame member forming an entrance opening,        the frame member being disposed in front of the operator seat;        and    -   an operation member disposed on a corner portion between the        panel and the frame member forming the entrance opening.

A cabin includes: a panel disposed on a side of an operator seat, thepanel including:

-   -   a plurality of cross members extending in a first direction;    -   a plurality of transverse members intersecting with the        plurality of cross members each other and extending in a second        direction; and    -   a frame member configured to connect between end portions of the        cross members and between end portions of the transverse        members;    -   a glass panel disposed on a side of the panel, the side being        opposite to the operator seat;    -   a window frame disposed on the glass panel;    -   a window panel configured to move along the glass panel;    -   a projecting member disposed on a side of the window panel, the        side being an identical side to the operator seat, the        projecting member being configured to move together with the        window panel; and    -   a guide portion configured to accept insertion of the projecting        member and to limit a moving distance of the window panel.

The cabin includes the window frame disposed on a side of the glasspanel, the side being an identical side to the operator seat. The glasspanel includes a rim forming an opening in a front portion of the windowframe. The window panel closes the opening by moving forward in thewindow frame and opens the opening by moving backward in the windowframe.

-   -   The cabin includes the guide portion disposed on a position        corresponding to a rear portion of the panel.

A working machine includes: the cabin;

-   -   an operation device including: a boom configured to freely swing        upward and downward; and an operation tool supported on a front        portion of the boom; and    -   a travel device.

A cabin includes:

-   -   a panel disposed on a side of an operator seat;    -   an outer peripheral portion disposed in the panel, the outer        peripheral portion including:        -   a rim forming an opening;    -   a first plate portion facing the outer peripheral portion on a        side of the panel, the side being an identical side to the        operator seat,    -   a second plate portion connected to the first plate portion and        connected to the outer peripheral portion; and    -   a duct formed of the outer peripheral portion and the plate        portion, the duct being communicated with the opening.

In the cabin, the outer peripheral portion includes an upper plateportion constituting an upper portion of the panel, and the rim disposedin the upper plate portion.

The cabin includes: a filter inserted to the rim; and a cover includinga plurality of louver portions each having an air inlet, the covercovering the filter.

The cabin includes a shield member disposed on a side of the louverportion, the side being opposite to the outer peripheral portion.

In the cabin, the shield member includes a plurality of plates extendingin a first direction and joint portions each jointing the plates.

In the cabin, the plates are disposed between the louver portions.

In the cabin, the shield member includes a fixation member configured tobe fixed to the cover.

A working machine includes the cabin, an operation device including: aboom configured to freely swing upward and downward; and an operationtool supported on a front portions of the boom; and a travel device.

The cabin includes the outer peripheral portion including: an upperplate portion constituting an upper portion of the panel, and the rimdisposed in the upper plate portion.

The cabin includes: a filter inserted to the rim; and

-   -   a cover including: a plurality of louver portions each having an        air inlet, the cover covering the filter,    -   The cabin includes: a shield member disposed on a side of the        louver portion, the side being opposite to the outer peripheral        portion.

The cabin includes the shield member including: a plurality of platesextending in a first direction; joint portions each jointing the plates.

-   -   The cabin includes the plates disposed between the louver        portions.

The cabin includes the shield member including: a fixation memberconfigured to be fixed to the cover.

-   -   A working machine includes: the cabin; an operation device        including:        -   a boom configured to freely swing upward and downward; and        -   an operation tool supported on a front portions of the boom;            and    -   a travel device.    -   A working machine includes: the cabin; a machine body configured        to support the cabin; an operation device disposed on the        machine body, the operation device including: a right boom        disposed on a right side of the cabin and being capable of        freely swinging upward and downward; a left boom disposed on a        left side of the cabin and being capable of freely swinging        upward and downward; and an operation tool supported on front        portions of the right boom and the left boom; a right travel        device disposed on a right side of the machine body; and a left        travel device disposed on a left side of the machine body.

A cabin includes: an operator seat; a frame member forming an entranceopening, the frame member being disposed in front of the operator seat;a roof arranged above the operator seat; a first panel configured to becapable of being moved to a first position where the front panel closesthe entrance opening and to a second position between the operator seatand the roof; a lock member disposed on the first panel, the lock memberbeing configured to be freely movable; a holding member configured to beengaged to the lock member to hold the first panel at the secondposition; and a pressing member configured to press the lock membertoward a direction opposite to a direction of engaging to the holdingmember.

The cabin includes: a second panel disposed on a side of the operatorseat, wherein the holding member is disposed on an upper portion of thefront portion of the second panel.

-   -   The cabin includes: a support member configured to support the        lock member, the support member being disposed on the first        panel; a first receiving portion disposed on the support member;        and a second receiving portion disposed on the lock member,        wherein the pressing member is disposed between the first        receiving portion and the second receiving portion.

The cabin includes: a first striker disposed on an upper portion of theframe member, the first striker projecting downward, wherein the firstpanel includes: a rim disposed on a portion corresponding to the firststriker at the first position; and a latch disposed on the rim, thelatch configured to be engaged to the first striker.

-   -   The cabin includes: a second striker configured to protrude        forward and to be engaged to the latch at the second position,        the second striker being disposed behind the operator seat and        under the roof.

A working machine includes: the cabin; a machine body configured tosupport the cabin; an operation device disposed on the machine body, theoperation device including: a right boom disposed on a right side of thecabin and being capable of freely swinging upward and downward; a leftboom disposed on a left side of the cabin and being capable of freelyswinging upward and downward; and an operation tool supported on frontportions of the right boom and the left boom; a right travel devicedisposed on a right side of the machine body; and a left travel devicedisposed on a left side of the machine body.

Effects of the Invention

A cabin of a working machine according to the present invention,comprises: an operator seat; and a panel disposed on a side of theoperator seat, the panel including: a plurality of cross membersextending along a front to rear direction and are disposed horizontallyat predetermined intervals; a plurality of transverse membersintersecting with the plurality of cross members each other and aredisposed vertically at predetermined intervals; a first reinforcementportion formed on at least one of the cross members or on at least oneof the transverse members; and a frame member configured to connectbetween end portions of the cross members and between end portions ofthe transverse members, the plurality of cross members and the pluralityof transverse members forming a grille. In this manner, stiffness of theside panel having the grille is improved by the first reinforcementportion.

Additionally, in a conventional side panel, a grille plate and a frameare assembled integrally after the grille plate and the frame areseparately manufactured. Meanwhile, in the present invention, a grilleand the frame member can be manufactured at the same time by the pressforming process, thereby further improving precision of the side panel.That is, the present invention can provide a side panel manufacturedwith high precision and high strength.

In addition, a cabin of a working machine according to the presentinvention, comprises: an operator seat; a panel disposed on a side ofthe operator seat; an outer peripheral portion disposed in the panel,the outer peripheral portion including: a rim forming an opening; afirst plate portion facing the outer peripheral portion, the first plateportion being disposed on a side opposite to the operator seat; a secondplate portion connected to the first plate portion at one end of thesecond plate portion and connected to the outer peripheral portion atthe other end of the second plate portion; and a duct formed of theouter peripheral portion, the first plate portion, and the second plateportion, the duct being communicated with the opening. In this manner, apart of the duct can be constituted of the outer peripheral portion ofthe side panel, the side panel constituting the cabin, and accordinglythe number of parts for forming the duct can be reduced and the numberof manufacturing processes also can be reduced.

Moreover, in a cabin of a working machine according to the presentinvention, a pressing member is configured to press the lock membertoward a direction opposite to a direction of the engagement to theholding member, and accordingly the first panel moves between the firstposition and the second position under a state the lock member ispressed backward from the holding member. In this manner, the lockmember can be prevented from hitting something disposed in the cabin inthe move of the first panel between the first position and the secondposition.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic perspective view of a cabin of a working machineaccording to an embodiment of the present invention;

FIG. 2 is an exploded perspective view of the cabin according to theembodiment;

FIG. 3 is a vertical cross-sectional view showing arrangements of a sidepanel, a glass panel, a window frame, and a window portion (a windowpanel) of the cabin according to the embodiment;

FIG. 4 is a perspective view of an outer side (an outer surface side) ofthe side panel according to the embodiment;

FIG. 5 is a perspective view of an inner side (an inner surface side) ofthe side panel according to the embodiment;

FIG. 6 is a perspective view of an outer side (an outer surface side) ofthe glass panel according to the embodiment;

FIG. 7 is a perspective view of an inner side (an inner surface side) ofthe glass panel according to the embodiment;

FIG. 8 is a view showing the inner side (the inner surface side) of theside panel where the window portion (the window panel) according to theembodiment is closed;

FIG. 9 is a view showing the inner side (the inner surface side) of theside panel where the window portion (the window panel) according to theembodiment is opened;

FIG. 10 is a front view of the cabin according to the embodiment;

FIG. 11 is a back view of a front panel of the cabin according to theembodiment;

FIG. 12 is a side cross-sectional view of the cabin according to theembodiment;

FIG. 13 is a plan view of a latch of the front panel according to theembodiment;

FIG. 14 is a perspective view of a lock device of and a roller of thefront panel according to the embodiment;

FIG. 15 is a back view of the lock device according to the embodiment;

FIG. 16 is an enlarged view of an upper back portion of a left side ofthe cabin according to the embodiment;

FIG. 17 is a view showing the upper back portion of the left side of thecabin according to the embodiment where a shield member is detached;

FIG. 18 is a view showing the upper back portion of the left side of thecabin according to the embodiment where a filter is detached;

FIG. 19 is a vertical cross-sectional view of a duct of the cabinaccording to the embodiment;

FIG. 20 is a horizontal cross-sectioned view of the duct according tothe embodiment;

FIG. 21 is a side view of a working machine according to the embodiment;and

FIG. 22 is a front view of the working machine according to theembodiment.

DESCRIPTION OF THE EMBODIMENTS

Referring to drawings, an embodiment of the present invention will bedescribed below.

-   -   FIG. 21 is a side view of a working machine according to an        embodiment of the present invention. FIG. 22 is a front view of        the working machine according to the embodiment of the present        invention. FIG. 21 and FIG. 22 show a Skid Steer Loader (SSL) as        an example of the working machine of the present invention. The        working machine of the present invention is not limited to the        Skid Steer Loader (SSL), and can be other types of the working        machine, for example, a Track Loader (TL), a Compact Track        Loader (CTL), and the like.

The skid steer loader 1 is the working machine according to theembodiment. The skid steer loader 1 includes a body 2 of the workingmachine (hereinafter referred to as a machine body 2), a cabin 3, anoperation device 4, and travel devices 5. The cabin 3 is mounted on themachine body 2. The operation device 4 is attached on the machine body2. The skid steer loader 1 includes two travel devices 5; one of thetravel devices 5 is provided on a right side of the machine body 2, andthe other one is provided on a left side of the machine body 2. A motor6 is mounted on a rear portion of the machine body 2. An operator seat 8is provided in the cabin 3. The motor 6 is an engine, an electric motor,and the like. The skid steer loader 1 according to the embodimentemploys a diesel engine. Hereinafter, in explanations of the embodimentof the present invention and in explanations of the modified examples ofthe embodiment, a forward direction (a direction shown by an arrowedline F in FIG. 21) corresponds to a front side of an operator seating onthe operator seat 8 of the skid steer loader 1, a backward direction (adirection shown by an arrowed B in FIG. 21) corresponds to a back sideof the operator, a leftward direction (a direction shown by an arrowedline L in FIG. 22) corresponds to a left side of the operator, and arightward direction (a direction shown by an arrowed line R in FIG. 22)corresponds to a right side of the operator.

-   -   In addition, in explanations of the embodiment of the present        invention and in explanations of the modified examples of the        embodiment, a direction from the front side shown by the arrowed        F toward the back side shown by the arrowed line B (or a        direction from the back side shown by the arrowed line B toward        the front side shown by the arrowed line A) is referred to as a        front to rear direction (or a rear to front direction), and a        horizontal direction perpendicular to the front to rear        direction (or the rear to front direction) is a direction K        along a width of the machine body 2. The direction K along the        width of the machine body 2 is hereinafter referred to as the        machine width direction K. As shown in FIG. 22, in the following        description, a direction from a center portion of the machine        body 2 toward the above mentioned right side can be referred to        as an outward direction. And, a direction from the center        portion of the machine body 2 toward the above mentioned left        side can be also referred to as the outward direction. The        outward direction is hereinafter referred to as a machine        outward direction. In other words, the machine outward direction        corresponds to a direction departing from the center portion of        the machine body 2 in the machine width direction K. A direction        opposite to the machine outward direction can be referred to as        an inward direction. The inward direction is hereinafter        referred to as a machine inward direction. In other words, the        machine inward direction corresponds to a direction toward the        center portion of the machine body 2 in the machine width        direction K.

As shown in FIG. 21 and FIG. 22, the operation device 4 includes booms10, an operation tool 11, lift links 12, control links 13, boomcylinders 14, and bucket cylinders 15.

-   -   The operation device 4 includes two booms 10; one of the booms        10 is provided on a right side of the cabin 3 (referred to as        the right boom 10) and is capable of freely swinging upward and        downward, and the other one is provided on a left side of the        cabin 3 (referred to as the left boom 10) and is capable of        freely swinging upward and downward. The operation tool 11 is a        bucket (hereinafter referred to as a bucket 11), for example.        The bucket 11 is provided on tip portions (front end portions)        of the booms 10 and is capable of freely swinging upward and        downward. The lift link 12 and the control link 13 support a        base portion (a rear portion) of the boom 10 so that the boom 10        is capable of freely swinging upward and downward. The boom        cylinder 14 is capable of being stretched and shortened, thereby        moving the boom 10 upward and downward. The bucket cylinder 15        is capable of being stretched and shortened, thereby swinging        the bucket 11.

The operation device 4 includes a joint pipe 7 having a deformed shape,that is, the joint pipe 7 being a deformed pipe. The joint pipe 7 isconnected to a front portion of the right boom 10 and to a front portionof the left boom 10 between the right boom 10 and the left boom 10,thereby jointing the right boom 10 and the left boom 10 with each other.The operation device 4 includes two lift links 12, two control links 13,and two boom cylinders 14. One of the lift links 12 (the right lift link12), one of the control links 13 (the right control link 13), and one ofthe boom cylinders 14 (the right boom cylinder 14) are provided on aright side of the machine body 2, corresponding to the right boom 10(also referred to as the corresponding boom 10). And, the other one ofthe lift links 12 (the left lift link 12), the other one of the controllinks 13 (the left control link 13), and the other one of the boomcylinders 14 (the left boom cylinder 14) are provided on a left side ofthe machine body 2, corresponding to the left boom 10 (also referred toas the corresponding boom 10).

-   -   The lift link 12 is vertically provided on a rear portion of the        base portion of the boom 10. The lift link 12 is supported at an        upper portion of the lift link 12 by a pivot shaft 16 (a first        pivot shaft) to be capable of freely turning around a horizontal        axis of the pivot shaft 16, the lift link 12 being supported on        the rear portion of the base portion of the boom 10 by the pivot        shaft 16. In addition, the lift link 12 is supported at a lower        portion of the lift link 12 by a pivot shaft 17 (a second pivot        shaft) to be capable of freely turning around a horizontal axis        of the pivot shaft 17, the lift link 12 being supported on the        rear portion of the machine body 2 by the pivot shaft 16. The        second pivot shaft 17 is disposed lower than the first pivot        shaft 16.

The boom cylinder 14 is supported at an upper portion of the boomcylinder 14 by a pivot shaft 18 (a third pivot shaft) to be capable offreely turning around a horizontal axis of the pivot shaft 18. The thirdpivot shaft 18 is disposed on the base portion of the boom 10 in frontof the first pivot shaft 16. The boom cylinder 14 is supported at alower portion of the boom cylinder 14 by a pivot shaft 19 (a fourthpivot shaft) to be capable of freely turning around a horizontal axis ofthe pivot shaft 19. The fourth pivot shaft 19 is disposed on a lowerportion of the rear portion of the machine body 2, being lower than thethird pivot shaft 18.

The control link 13 is disposed in front of the lift link 12. One end ofthe control link 13 is supported by a pivot shaft 20 (a fifth pivotshaft) to be capable of freely turning around a horizontal axis of thepivot shaft 20. The fifth pivot shaft 20 is disposed on the machine body2. The other end of the control link 13 is supported by a pivot shaft 21(a sixth pivot shaft) to be capable of freely turning around ahorizontal axis of the pivot shaft 21. The sixth pivot shaft 21 isdisposed on the boom 10 in front of the second pivot shaft 17, beinghigher than the second pivot shaft 17.

Stretching and shortening of the boom cylinder 14 swing the boom 10upward and downward around the first pivot shafts 16, the boom 10 beingsupported on the base portion of the boom 10 by the lift link 12 and thecontrol link 13, thereby moving a tip portion of the boom 10 upward anddownward. The control link 13 is swung upward and downward around thefifth pivot shaft 20 by the swinging upward and downward of the boom 10.The lift link 12 is swung forward and backward around the second pivotshaft 17 by the swinging upward and downward of the control link 13.

An attachment body 23 is pivotally supported on the front portions (thetip portions) of the booms 10. The bucket 11 is attached to theattachment body 23 and is capable of being freely attached and detached.The attachment body 23 is supported on the front portions of the booms10 by a pivot pin 24, thereby being capable of freely turning about ahorizontal axis of the pivot pin 24. Not only the bucket 11, otheroperation tools can be attached to the attachment body 23. The followingattachments (spare attachments) are exemplified as the other operationtools; for example, a hydraulic crusher, a hydraulic breaker, an anglebroom, an earth auger, a pallet fork, a sweeper, a mower, a snow blower,and the like.

The bucket cylinder 15 is arranged on the front portion of the boom 10.The bucket cylinder 15 is pivotally supported on the boom 10 by a firstbucket cylinder pin 26 at an upper portion of the bucket cylinder 15,thereby being capable of freely turning about a horizontal axis of thefirst bucket cylinder pin 26. The bucket cylinder 15 is pivotallysupported on the attachment body 23 by a second bucket cylinder pin 27at a lower portion of the bucket cylinder 15, thereby being capable offreely turning about a horizontal axis of the second bucket cylinder pin27. Stretching and shortening of the bucket cylinder 15 swing the bucket11.

In the embodiment, both of the right travel device 5 and the left traveldevice 5 employ a wheeled travel device, the wheeled travel devicehaving a front wheel 5F and a rear wheel 5R. However, a crawler traveldevice (including a semi-crawler travel device) may be employed as thetravel device 5.

-   -   Next, a concrete configuration of the cabin 3 will be described        below.    -   As shown in FIG. 1 and FIG. 21, the cabin 3 includes an operator        seat 8, a roof 30, panels 31, a panel 32, and a panel 33. The        roof 30 is arranged above the operator seat 8. The panels 31 are        arranged on sides (a right side and a left side) of the operator        seat 8 (hereinafter referred to as side panels 31). The panel 32        is arranged in front of the operator seat 8 (hereinafter        referred to as a front panel 32). The panel 33 is arranged in        back of the operator seat 8 (hereinafter referred to as a rear        panel 33). In the explanation described below, a side facing a        direction outward the cabin 3 may be referred to as an outer        side, that is, a side opposite to the operator seat 8 (a side        opposite to the inside of the cabin 3), and a side facing a        direction inward the cabin 3 may be referred to as an inner        side, that is, a side identical to the operator seat 8 (a side        identical to the inside of the cabin 3).    -   As shown in FIG. 2 and FIG. 3, a glass panel 34 is disposed on        the side opposite to the operator seat 8 (on the outer side) of        the side panel 31. In particular, the side panel 31 includes a        concave portion 35, the concave portion 35 being concaved toward        the side identical to the operator seat 8 (toward the inner        side). The glass panel 34 is fitted to the concave portions 35.

Then, concrete configurations of the side panel 31 and the glass panel34 will be described below.

-   -   The side panel 31 will be explained at first.    -   As shown FIG. 4 and FIG. 5, the side panel 31 includes a        plurality of cross members 36, a plurality of transverse members        37, and a frame member 38.    -   The plurality of cross members 36 extend along the front to rear        direction (or the rear to front direction) and are disposed        horizontally at predetermined intervals. Each of the cross        members 36 is formed to be a strip and extends horizontally        across the frame member 38. In particular, each of the cross        members 36 is connected to a front portion of the frame member        38 at a front end of the cross member 36, and is connected to a        rear portion of the frame member 38 at a rear end of the cross        member 36. The plurality of transverse members 37 extend along a        vertical direction and are disposed vertically at predetermined        intervals. Each of the transverse members 37 is formed to be a        strip and extends vertically across the frame member 38. In        particular, each of the transverse members 37 is connected to an        upper portion of the frame member 38 at an upper end of the        transverse member 37, and is connected to a lower portion of the        frame member 38 at a lower end of the transverse member 37. The        plurality of cross members 36 intersect with the plurality of        transverse members 37 each other, thereby forming a grille with        many openings, the openings being also referred to as grille        openings.

The plurality of cross members 36 are disposed horizontally atpredetermined intervals, and the plurality of transverse members 37 aredisposed vertically at predetermined intervals. The interval between thecross members 36 adjacent to each other is, for example, equal to theinterval between the transverse members 37 adjacent to each other. Inaddition, the cross members 36 are perpendicular to the transversemembers 37, thereby forming a grille with many square openings.Meanwhile, in the embodiment of the present invention, the intervalbetween the cross members 36 adjacent to each other may be differentfrom the interval between the transverse members 37 adjacent to eachother. An angle of intersection between the cross member 36 and thetransverse member 37 is not limited only to the example shown in thedrawings.

The frame member 38 is disposed around the plurality of cross members 36and the plurality of transverse members 37 to enclose the cross members36 and the transverse members 37. That is, the frame member 38 connectsbetween end portions of the cross members 36 and between end portions ofthe transverse members 37. In particular, the frame member 38 includesan inner peripheral portion 39 and an outer peripheral portion 40. Theinner peripheral portion 39 includes a front portion, a rear portion, anupper portion, and a lower portion, and has a rectangular shape whenseen from the inner side or the outer side. The front ends of the crossmembers 36 are connected to the front portion of the inner peripheralportion 39. The rear ends of the cross members 36 are connected to therear portion of the inner peripheral portion 39. The upper ends of thetransverse members 37 are connected to the upper portion of the innerperipheral portion 39. The lower ends of the transverse members 37 areconnected to the lower portion of the inner peripheral portion 39.

The outer peripheral portion 40 has a rectangular shape when seen fromthe inner side or the outer side, and is disposed around the innerperipheral portion 39 to enclose the inner peripheral portion 39. Theouter peripheral portion 40 includes a front plate portion 40F, a rearplate portion 40R, an upper plate portion 40U, and lower plate portion40D. The front plate portion 40F is positioned in front of the innerperipheral portion 39. The rear plate portion 40R is positioned in backof the inner peripheral portion 39. The upper plate portion 40U ispositioned above the inner peripheral portion 39. The lower plateportion 40D is positioned under the inner peripheral portion 39. Thefront plate portion 40F is positioned apart from the rear plate portion40R. The upper plate portion 40U joints between an upper portion of thefront plate portion 40F and an upper portion of the rear plate portion40R with each other. The lower plate portion 40D joints between a lowerportion of the front plate portion 40F and a lower portion of the rearplate portion 40R with each other.

The front plate portion 40F, the rear plate portion 40R, the upper plateportion 40U, and the lower plate portion 40D each include an outer rimportion 42. The outer rim portion 42 is constituted of protrusionsprojecting toward the operator seat 8 (toward the inner side) from eachof the front plate portion 40F, the rear plate portion 40R, the upperplate portion 40U, and the lower plate portion 40D. In addition, thefront plate portion 40F, the rear plate portion 40R, the upper plateportion 40U, and the lower plate portion 40D each include an inner rimportion 43. The inner rim portion 43 is constituted of protrusionsprojecting toward the operator seat 8 (toward the inner side) from eachof the front plate portion 40F, the rear plate portion 40R, the upperplate portion 40U, and the lower plate portion 40D. End portion (on aninner side) of the inner rim portion 43 reaches the inner peripheralportion 39, and thus the inner rim portion 43 and the inner peripheralportion 39 form the concave portion 35.

As shown in FIG. 7, the grille includes a guide portion (a guide frame)47, the grille being formed in the side panel 31. The glass panel 34includes a window panel 45 having a projecting member 46. The guideportion 47 guides movement of the projecting member 46 of the windowpanel 45 disposed on the glass panel 34. In particular, the guideportion 47 enables the window panel 45 to move forward and backwardtogether with the projecting member 46, and provides a function to limit(restrict) a moving distance of the window panel 45. Detailedconfigurations of the glass panel 34 will be described below.

The guide portion 47 is formed of a portion surrounded by: twotransverse members 37 not adjacent to each other; and two cross members36 adjacent to each other. The cross members 36 adjacent to each otherare positioned apart from each other only at a distance corresponding toone grille opening. On the other hand, the transverse members 37 notadjacent to each other are positioned apart from each other at adistance corresponding to a plurality of the grille openings (sevengrille openings in the drawings).

-   -   The projecting member 46 contacts and slides on the cross        members 36 of the guide portion 47 when the window panel 45 is        being opened and closed. For this reason, it is preferred to        make the cross members 36 be thicker in a portion contacting the        projecting member 46 than in the rest portion not contacting the        projecting member 46 as shown in FIG. 4 and FIG. 5. In addition,        the projecting member 46 contacts the transverse members 37 of        the guide portion 47 when the window panel 45 is being opened        and closed. For this reason, it is preferred to make the        transverse members 37 be thicker in a portion contacting the        projecting member 46 than in the rest portion not contacting the        projecting member 46, not shown in the drawings.

The guide portion 47 is disposed on a position corresponding to a rearportion of the side panel 31, and forms a long opening that is elongatedalong the front to rear direction (or the rear to front direction) andhas a rectangular shape. The guide portion 47 can be formed, forexample, by cutting off some of the transverse members 37 adjacent alongthe front to rear direction (or the rear to front direction), from amongthe plurality of transverse members 37 and the plurality of crossmembers 36 each constituting the grille, only by a length (a height) ofthe grille opening (hereinafter referred to as a unit length (or a unitheight)).

The side panel 31 has a reinforcement member, the reinforcement memberbeing a portion reinforced to increase stiffness of the side panel 31.The reinforcement member includes a first reinforcement portion 48.

-   -   The first reinforcement portion 48 is formed in the transverse        member 37. For details, as shown in FIG. 3 to FIG. 5, the first        reinforcement portion 48 is formed by deforming the transverse        member 37 to be partially projected toward the side opposite to        the operator seat 8 (toward the outer side). For further        details, the first reinforcement portion 48 is formed by        deforming a portion of the transverse member 37 to be projected,        the portion being between the cross members 36 adjacent to each        other. The projection of the first reinforcement portion 48 has        a V-shape in the example shown in the drawings, and may have a        U-shape or a W-shape. The first reinforcement portion 48 may be        formed in all the transverse members 37 in the unit lengths        identical to each other (or the unit heights identical to each        other), and may be formed in some of the transverse members 37.        For example, the first reinforcement portion 48 may be formed in        portions of the plurality of transverse members 37, the portions        being between the second cross member 36 from the upper portion        and the third cross members 36. For another example, the first        reinforcement portion 48 may be formed in portions of the        plurality of transverse members 37, the portions being between        the fourth cross member 36 from the upper portion and the fifth        cross members 36. That is, the first reinforcement portion 48        may be formed in portions of the plurality of transverse members        37, the portions being between the i-th cross member 36 from the        upper portion and the (i+1)-th cross members 36. Meanwhile, the        symbol [i] means the number of the cross members 36, and the        symbol [i] is natural number, that is, 1, 2, 3, and so on.

In the above-mentioned description, the first reinforcement portion 48is disposed on the transverse member 37 in the example shown in thedrawings. However, the first reinforcement portion 48 may be disposed onthe cross members 36 and on both of the transverse members 37 and thecross members 36.

The side panel 31 includes the first reinforcement portion 48 describedabove. Thus, the first reinforcement portion 48 provides a function tosuppress deformation of the cross members 36 or the transverse members37 each forming the grille. In this manner, the stiffness of the sidepanel 31 is improved, and the side panel 31 can be prevented fromdeforming accordingly.

-   -   The side panel 31 having the above-mentioned configurations can        be manufactured by processing a metal plate.

The manufacturing of the side panel 31 includes a first process, asecond process, and a third process. The first process prepares a metalplate, and forms openings in the prepared metal plate (a flat plate)through a process for forming openings, thereby forming the grille. Thatis, the first process forms the grille in the metal plate.

-   -   A laser processing, a punch press processing, and other        processing methods may be employed as the process for forming        the openings.

The second process presses the plate having the grille, using a pressforming process, to form the first reinforcement portion 48. The thirdprocess presses the plate, using the press forming process, to form theconcave portion 35 and the outer rim portion 42, the plate alreadyhaving the grille and the first reinforcement portion 48.

-   -   The side panel 31 is finished by other necessary process as        needed after the above-mentioned first process to second        process.

The above-mentioned manufacturing method is different from aconventional method for manufacturing a side panel. The conventionalmethod firstly deforms a plate through a press forming process, and thenperforms a process for forming openings in the pressed plate, therebyforming a grille. In addition, another conventional method, that is alsoa conventional method for manufacturing a side panel, firstly formsopenings in a flat panel to form a grille, and then integrally assemblesthe flat panel having the grille on a frame deformed by a press formingprocess, using a welding process or a bolt fastening process. However,the former conventional method has to perform the laser processing morethan once using a three-dimensional laser because the process forforming openings is performed on the deformed plate, and the latterconventional method has to perform the welding process or the boltfastening process in addition to the process for forming openings andthe press forming process. Both of the conventional methods require manyprocesses accordingly. A possible method firstly forms openings in aflat plate to form a grille plate, and then presses the grille plate toform a concave portion and a frame portion at the same time. The methodcan be considered as a method for reducing the number of processes.However, when the grille plate is pressed to be deformed, the grilleplate will be cracked and undulate because of the low stiffness of thegrille plate.

On the contrary, the method according to the embodiment of the presentinvention firstly forms openings in a flat plate to form a grille, andthen forms the first reinforcement portion 48 on the flat plate havingthe grille, using the press forming process. Then, the method is capableof manufacturing the side panel 31 by only performing the press formingprocess on the plate having the grille and the first reinforcementportions 48.

-   -   In addition, the side panel 31 is provided with the improved        high stiffness due to the first reinforcement portion 48 formed        by using the press forming process, thereby being hard to be        deformed. Thus, the side panel 31 is prevented from being        cracked and undulating.

The cabin 3 can be manufactured by assembling the roof 30, the frontpanel 32, the rear panel 33, the glass panel 34, the operator seat 8,and the like with the side panel 31 manufactured in the above-mentionedmanner.

-   -   Then, a concrete configuration of the glass panel 34 will be        described below.    -   As shown in FIG. 1 to FIG. 3, FIG. 5, and FIG. 6, the glass        panel 34 is secured by a frame 50 at a circumferential portion        of the glass panel 34, and is fitted to the concave portion 35        of the side panel 31 together with the frame 50.

A window frame 51 is disposed on the side (the inner side) of the glasspanel 34, the inner side being an identical side to the operator seat 8(the side identical to the inside of the cabin 3).

-   -   As shown in FIG. 7, the window frame 51 includes an upper frame        portion 52, a lower frame portion 53, and a front frame portion        54. The upper frame portion 52 is extended along the front to        rear direction (or the rear to front direction) at a position        near the upper rim portion of the frame 50. The lower frame        portion 53 is extended along the front to rear direction (or the        rear to front direction) at an approximately intermediate        position between the upper rim portion and the lower rim portion        of the frame 50. The front frame portion 54 is vertically        extended to connect between a front end portion of the upper        frame portion 52 and a front end portion of the lower frame        portion 53.

The window panel 45 is formed of a glass plate. The window panel 45 isfitted to the window frame 51. The window panel 45 is capable of moving(sliding) forward and backward along the upper frame portion 52 and thelower frame portion 53 of the window frame 51.

-   -   The glass panel 34 includes a circular rim 55 in a front portion        of the window frame 51, the rim 55 forming an opening. The        window panel 45 moves (slides) forward within the window frame        51, thereby closing the opening formed by the rim 55, and moves        (slides) backward within the window frame 51, thereby releasing        the opening.

As shown in FIG. 7 to FIG. 9, the window panel 45 is provided with theprojecting member 46. The projecting member 46 is disposed on the side(the inner side) of the window panel 45, the inner side being anidentical side to the operator seat 8 (the side identical to the insideof the cabin 3), that is, on the window panel 45. The projecting member46 is inserted to the guide portion 47 and is capable of moving(sliding) between a front end and a rear end of the guide portion 47 inaccordance with the forward and backward moving (sliding) of the windowpanel 45.

-   -   As described above, the projecting member 46 is disposed on a        rear portion of the window panel 45, the projecting member 46        being inserted to the guide portion 47. The guide portion 47 is        disposed on a rear portion of the side panel 31. In addition,        the opening formed by the rim 55 is disposed on a front portion        of the window frame 51. As shown in FIG. 9, even when the window        panel 45 is moved (slid) backward to release the opening, the        guide portion 47 is not communicated with an outside of the        cabin 3 through the opening. That is, even when the window panel        45 is moved (slid) backward to release the opening, the guide        portion 47 can be separated from the outside of the cabin 3 by a        portion (a rear portion) of the glass panel 34, the rear portion        not having the opening of the glass panel 34. In other words, a        position of the rim 55 forming the opening does not correspond        to a position of the guide portion 47, and is different from the        position of the guide portion 47 in the front to rear direction        (or the rear to front direction). The rim 55 is opposite to the        grille of the side panel 31, that is, the rim 55 faces a portion        forming the grille.

As described above, the inside of the cabin 3 is communicated with theoutside of the cabin 3 when the opening is released. However, the grilleof the side panel 31 is capable of protecting the side of the operatorseat 8 regardless of the communication. In addition, since the glasspanel 34 is arranged on an outside of the side panel 31 (the sideopposite to the operator seat 8), the glass panel 34 can be easilyattached, detached, and cleaned from the outside of the cabin 3. Inother words, the grille of the side panel 31 does not interfere theattachment, the detachment, and the cleaning of the glass panel 34. FIG.9 shows a portion of the grille, the portion being surrounded by anoval, by excluding the rest portion of the grille (the outside of theoval), thereby clearly showing the window panel 45, the window frame 51,and the rim 55.

FIG. 11 shows a back surface of the front panel 32. As shown in FIG. 11,the front panel 32 includes a panel frame 102 and a panel plate 103.

-   -   The panel frame 102 includes an upper frame portion 104, a right        frame portion 105, a left frame portion 106, and a lower frame        portion 107. The panel frame 102 is formed to be a        substantially-quadrangular frame. The upper frame portion 104 is        arranged on an upper side of the panel frame 102. The right        frame portion 105 is arranged on a right side of the panel frame        102. The left frame portion 106 is arranged on a left side of        the panel frame 102. The lower frame portion 107 is arranged on        a lower side of the panel frame 102. An opening 108 is        surrounded by and formed of the upper frame portion 104, the        right frame portion 105, the left frame portion 106, and the        lower frame portion 107. A seal member 109 is firmly fixed on a        lower surface of the lower frame portion 107.

The panel plate 103 is constituted of a transparent glass plate. Thepanel plate 103 is fixed on a front surface of the panel frame 102 andcloses the opening 108 of the panel frame 102.

-   -   As shown in FIG. 10 and FIG. 12, the cabin 3 includes a frame        member 74, the frame member 74 (hereinafter referred to as the        entrance frame 74) forming an opening 101 for getting on and off        (hereinafter referred to as an entrance opening 101). The        entrance frame 74 includes an upper frame portion 75, a lower        frame portion 76, a left frame portion 77, and a right frame        portion 78. The upper frame portion 75 extends downward from a        front end portion of the roof 30 and is positioned on or above        an upper portion of the front panel 32. The lower frame portion        76 is opposite to the upper frame portion 75 and is positioned        on or under a lower portion of the front panel 32. The left        frame portion 77 is positioned on or beside a left portion of        the front panel 32, the left portion being the outer rim portion        42 disposed on a front side of the left side panel 31. The right        frame portion 78 is positioned on or beside a right portion of        the front panel 32, the right portion being the outer rim        portion 42 disposed on a front side of the right side panel 31.        The upper frame portion 75, the lower frame portion 76, the left        frame portion 77, and the right frame portion 78 are provided        with a seal member 56 or the seal member 109.

The front panel 32 is in contact with the seal member 56 from behind(from an inside of the cabin 3), thereby closing the entrance opening101.

-   -   As shown in FIG. 12, the front panel 32 is capable of being        moved to a closing position S1 (a first position) where the        front panel 32 closes the entrance opening 101 as shown by a        solid line in FIG. 12 and to a housing position S2 (a second        position) where the front panel 32 is housed between the        operator seat 8 and the roof 30 as shown by a two-dot chain line        in FIG. 12, and thus the front panel 32 is capable of being        freely moved between the closing position S1 and the housing        position S2. The entrance opening 101 is opened when the front        panel 32 is moved to the housing position S2.

In addition, a pair of strikers (first strikers) 110 are disposed on aback surface of the upper frame portion 75 of the entrance frame 74 (ona surface facing the inside of the cabin 3) as shown in FIG. 12. One ofthe first strikers 110 is disposed on a left side of the back surface,and the other one of the first strikers 110 is disposed on a right sideof the back surface. Each of the first strikers 110 is fixed tocorresponding one of brackets 111, the brackets 111 being disposed onthe upper frame portion 75 of the entrance frame 74. Each of the firststrikers 110 project downward from the corresponding bracket 111.

In addition, a pair of strikers (second strikers) 112 are disposed on arear portion of the roof 30, that is, behind the operator seat 8 andunder the roof 30. One of the second strikers 112 is disposed on a leftside of the rear portion of the roof 30, and the other one of the secondstrikers 112 is disposed on a right side of the rear portion of the roof30. Each of the second strikers 112 is fixed to corresponding one ofbrackets 113, the brackets 113 being disposed on a side closer to alower surface of the roof 30.

-   -   A pair of latches 114 are disposed on an upper surface 104 a of        the upper frame portion 104 of the front panel 32, that is, on a        rim laying under the first strikers 110 when the front panel 32        is moved to the first position S1 (portions corresponding to the        first strikers 110 when the front panel 32 is moved to the first        position S1). One of the latches 114 is disposed on a left side        of the upper surface 104 a, and the other one of the latches 114        is disposed on a right side of the upper surface 104 a. Each of        the latches 114 is capable of being engaged to the corresponding        strikers 110 and 112.

Each of the latches 114 is capable of being engaged to the correspondingfirst striker 110 under a state where the front panel 32 is moved to theclosing position S1. And, each of the latches 114 is capable of beingengaged to the corresponding second striker 112 under a state where thefront panel 32 is moved to the housing position S2.

-   -   In addition, the latch 114 disposed on the right side is capable        of being engaged to the strikers 110 and 112 disposed on the        right side, and the latch 114 disposed on the left side is        capable of being engaged to the strikers 110 and 112 disposed on        the left side. In addition, the front panel 32 is held at the        closing position S1 when the latch 114 is engaged to the first        striker 110, and the front panel 32 is held at the housing        position S2 when the latch 114 is engaged to the second striker        112. The front panel 32 becomes repositionable (becomes capable        of being freely moved) when the engagement between the latch 114        and the striker 110 or 112 is released.

Meanwhile, at least one grip or finger grip (not shown in the drawings)is disposed on an inner side of the front panel 32 (inside the cabin 3),the grip or the finger grip being grasped or pinched for the move(reposition) of the front panel 32.

-   -   As shown in FIG. 13, the latch 114 includes an engagement plate        116 and a lock plate 117. The engagement plate 116 is engaged to        the strikers 110 and 112. The lock plate 117 holds the        engagement between the engagement plate 116 and the strikers 110        and 112. FIG. 13 shows the latch 114 disposed on the right side        of the front panel 32.

The engagement plate 116 is supported on a first bracket 118 by a firstpivot shaft 119 to be capable of freely turning, the first bracket 118being fixed to the upper frame portion 104 of the panel frame 102. Thelock plate 117 is supported on a second bracket 120 by a second pivotshaft 121 to be capable of freely turning, the second bracket 120 beingfixed to the upper frame portion 104 of the panel frame 102.

-   -   The engagement plate 116 is pressed by a spring 122 toward a        direction shown by an arrowed line X1, the spring 122 being        formed of a twisted coil spring. The lock plate 117 is pressed        by a spring 123 toward a direction shown by an arrowed line X2,        the spring 123 being formed of a twisted coil spring. The        engagement plate 116 is provided with an engagement concave        portion 124. An engagement portion 125 is formed in the lock        plate 117, the engagement portion 125 being configured to engage        to the engagement concave portion 124.

The turn of the engagement plate 116 is restricted in the directionshown by the arrowed line X1 when the engagement portion 125 is engagedto the engagement concave portion 124 under a state where the engagementplate 116 is engaged to the strikers 110 and 112. In this manner, therestriction keeps the engagement between the engagement plate 116 andthe strikers 110 and 112.

-   -   The lock plate 117 is provided with a connecting portion 128,        the connecting portion 128 being connected to an inner wire 127        of a Bowden wire (a Bowden cable) 126. The inner wire 127 of the        Bowden wire 126 is connected to a handle tool 129 (refer to        FIG. 11) disposed on a back surface of a lower portion of the        front panel 32 (inside the cabin 3), thereby moving in        synchronization with the handle tool 129.

The engagement portion 125 is separated from the engagement concaveportion 124 when the Bowden wire 126 is operated by the handle tool 129to pull the connecting portion 128 of the lock plate 117 toward thedirection shown by an arrowed line Y. The engagement plate 116 becomescapable of turning toward the direction shown by the arrowed line X1when the engagement portion 125 is separated from the engagement concaveportion 124, and thereby the engagement plate 116 can separate from thestrikers 110 and 112.

-   -   In addition, as shown in FIG. 10, a grip (a handle grip) 130 is        disposed on the front panel 32. The grip 130 is disposed on a        front surface of the lower portion of the front panel 32        (outside the cabin 3). The front panel 32 can be handled from        the outside with the grasp of the grip 130. The grip 130 is        provided with a release portion 131. The release portion 131 is        capable of being manipulated (pushed). The manipulation        (pushing) of the release portion 131 can operate the Borden wire        126.

As shown in FIG. 12, a guide rail 132 is disposed on the front portionof each of the side panels 31. The guide rail 132 is disposed, from anupper portion of the side panel 31 to the lower portion, on the sidepanel 31. In addition, as shown in FIG. 8 and FIG. 9, the guide rail 132is fixed to an attachment plate 133 attached on the side panel 31.

-   -   As shown in FIG. 11, a roller 134 is disposed on each of a right        side and a left side of a lower end of the front panel 32. The        roller 134 disposed on the right side is engaged to the guide        rail 132 disposed on the right side. The roller 134 disposed on        the left side is engaged to the guide rail 132 disposed on the        left side. Each of the rollers 134 is capable of moving along a        longitudinal direction of the guide rail 132.

In addition, a support device 135 is disposed on an upper portion of thefront portion of each of the side panels 31, the support device 135being configured to support the front panel 32.

-   -   The support device 135 includes a swing link 136 and a gas        spring 137.    -   The swing link 136 is pivotally supported on a bracket 138 by an        upper pivot shaft 139 at one end (an upper portion) of the swing        link 136, the bracket 138 being fixed to the roof 30. And, the        swing link 136 is pivotally supported on a bracket 140 by a        lower pivot shaft 141 at the other end (a lower portion) of the        swing link 136, the bracket 140 being fixed to a side frame        portion of the panel frame 102.

The gas spring 137 is pivotally supported on an upper portion of theswing link 136 at one end (an upper portion) of the gas spring 137. Thegas spring 137 is pivotally supported on a bracket 142 at the other end(a lower portion) of the gas spring 137, the bracket 142 being fixed tothe guide rail 132.

-   -   Considering the front panel 32 moving from the closing position        S1 to the housing position S2, the engagement between the first        striker 110 and the latch 114 is released at first, then the        front panel 32 is moved from the closing position S1, shifting        an upper portion of the front panel 32 backward. Then, the        roller 134 moves from the lower portion of the guide rail 132 to        the upper portion, and thus the lower portion of the front panel        32 moves upward. In this manner, the front panel 32 is        positioned at a pre-housing position S3 under the housing        position S2 as shown by the two-dot chain line in FIG. 12.

In the move of the front panel 32 from the closing position S1 to thehousing position S3, the lower portion of the swing link 136 swingsbackward about the upper pivot shaft 139 with the move of the frontpanel 32. The above-described swing link 136 supports the front panel32, allowing the move of the front panel 32. In addition, the gas spring137 stretches to provide a rotational force to the swing link 136, therotational force being applied backwardly upward (upwardly backward),thereby helping the move of the front panel 32.

Then, the front panel 32 is moved upward after the front panel 32 ismoved to the pre-housing position S3, and thereby the front panel 32 ispositioned at the housing position S2 and the latch 114 is engaged tothe second striker 112.

-   -   In the following descriptions, a direction along a width of the        front panel 32 is referred to as a panel width direction, the        panel width direction being a direction shown by an arrowed line        W in FIG. 14 and FIG. 15. In addition, a direction from a center        of the width of the front panel 32 toward an end of the width of        the front panel 32 is referred to as an outward panel width        direction, the outward panel width direction being a direction        shown by an arrowed line W1 in FIG. 11, FIG. 14, and FIG. 15.        Moreover, a direction from the end of the width of the front        panel 32 toward the center of the width of the front panel 32 is        referred to as an inward panel width direction, the inward panel        width direction being a direction shown by an arrowed line W2 in        FIG. 11, FIG. 14, and FIG. 15.

As shown in FIG. 11, a pair of lock devices 143 is disposed on the lowerportion of the front panel 32.

-   -   As shown in FIG. 14 and FIG. 15, the lock device 143 includes a        lock member 144, a support member 145, and a pressing member        146. the support member 145 supports the lock member 144. The        pressing member 146 presses the lock member 144. FIG. 14 and        FIG. 15 show the lock device 143 disposed on the left side.

The lock member 144 is constituted of a pin, the pin having an axisextending along the panel width direction W. The lock member 144 isprovided with a manipulation knob 147 and an engagement member 148, themanipulation knob 147 being for manipulating the lock member 144, theengagement member 148 being for positioning the lock member 144.

-   -   The lock member 144 includes a large diameter portion 149 and a        small diameter portion 150. The large diameter portion 149 has a        cylindrical shape. The small diameter portion 150 has a        cylindrical shape having a diameter smaller than that of the        large diameter portion 149.

The lock member 144 includes a portion serving as the large diameterportion 149, the portion being inwardly in the inward panel widthdirection W2. The lock member 144 includes a portion serving as thesmall diameter portion 149, the portion being outwardly in the outwardpanel width direction W1. The manipulation knob 147 and the engagementmember 148 are disposed on the large diameter portion 149. Themanipulation knob 147 is disposed inwardly in the inward panel widthdirection W2 than the engagement member 148.

-   -   The support member 145 includes an attachment plate 151 and a        guide member 152.

The attachment panel 151 is attached to a fixation member 153, thefixation member 153 being fixed to a panel frame 102.

-   -   One of the fixation members 153 is fixed to both of: a lower end        portion of the side frame portion 105 of the panel frame 102;        and an end portion of the lower frame portion 107 in the panel        width direction W. The other one of the fixation members 153 is        fixed to both of: a lower end portion of the side frame portion        106 of the panel frame 102; and an end portion of the lower        frame portion 107 in the panel width direction W. A support        bracket 154 is attached to the fixation member 153, the support        bracket 154 being configured to support the roller 134.    -   The attachment plate 151 includes a first plate portion 155 and        a second plate portion 156. The first plate portion 155 is put        on a back surface of the fixation member 153 to be overwrapped        with the back surface, and is fixed to the fixation member 153        by bolts. The second plate portion 156 protrudes backward from        an end portion of the first plate portion 155, the end portion        being disposed in the outward panel width direction W1. A pin        insertion hole 157 is formed in the second plate portion 156.

The guide member 152 is formed of a member extending along the panelwidth direction W, having a U-shape when seen from the side of the guidemember 152. The guide member 152 is fixed to the first plate portion155, the first plate portion 155 closing an opening side of the guidemember 152 arranged on the first plate portion 155. The lock member 144is inserted to the guide member 152. The small diameter portion 150 ofthe lock member 144 is inserted to the pin insertion hole 157, and moves(slides) in the pin insertion hole 157 along the panel width directionW. The large diameter portion 149 of the lock member 144 protrudestoward the inward panel width direction W2 from the guide member 152.The manipulation knob 147 is disposed on the protruding portion.

A guide slit 158 is formed in the guide member 152. The guide slit 158is formed in the guide member 152 on a side being in the inward panelwidth direction W2. The engagement member 148 is disposed in the guideslit 158.

-   -   The guide slit 158 includes a first slit 159, a second slit 160,        and a third slit 161.    -   The first slit 159 allows the engagement member 148 (the lock        member 144) to move (slide) within a predetermined length along        the panel width direction W. The second slit 160 and the third        slit 161 restrict the moving (sliding) of the engagement member        148 (the lock member 144) in the panel width direction W.

The second slit 160 is formed on an end of the first slit 159 in theoutward panel width direction W1. The third slit 161 is formed on an endof the first slit 159 in the inward panel width direction W2.

-   -   The engagement member 148 can be moved (slid) from the first        slit 159 to the second slit 160 or from the first slit 159 to        the third slit 161 by turning the lock member 144 about an axis        of the lock member 144.    -   In the embodiment, the pressing member 146 is constituted of a        coil spring, and is fitted externally to the small diameter        portion 150. One end of the pressing member 146 contacts to the        second plate portion 156. The other end of the pressing member        146 contacts to the large diameter portion 149. In this manner,        a pressing force of the pressing member 146 is applied to press        the lock member 144 toward the inward panel width direction W2.        Since the lock member 144 is pressed toward the inward panel        width direction W2, the lock member 144 is held at a position        where the small diameter portion 150 of the lock member 144 does        not protrude so much.

The pressing member 146 contacts to the second plate portion 156, andthe second plate portion 156 includes a portion contacting to thepressing member 146 as a first receiving portion 162. The pressingmember 146 contacts to the large diameter portion 149, and the largediameter portion 149 includes a portion contacting to the pressingmember 146 as a second receiving portion 163.

-   -   As shown in FIG. 12, a holding member 164 is disposed on an        upper portion of the front portion of each of the side panels        31. The holding member 164 is fixed to the attachment plate 133        as shown in FIG. 9.

The holding member 164 is formed of a cylindrical member, thecylindrical member having an axis extending along the panel widthdirection W.

-   -   As shown in FIG. 15, the holding member 164 and the lock member        144 are positioned corresponding to each other in the panel        width direction W, that is, being opposite to each other, when        the front panel 32 is positioned at the housing position S2.    -   Accordingly, after the front panel 32 is positioned at the        housing position S2, the small diameter portion 150 protrudes        much from the second plate portion 156 when the lock member 144        is moved (slid) toward the outward panel width direction W1        against the pressing force of the pressing member 146.

After the small diameter portion 150 is engaged (inserted) to theholding member 164, the lock member 144 is restricted from moving(sliding) backward from the holding member 164 when the engagementmember 148 is positioned at (moved to) the second slit 160 by turningthe lock member 144 about the axis of the lock member 144. In thismanner, the small diameter portion 150 is inserted to the holding member164 to be held by the holding member 164.

-   -   A side of the front panel 32 can be held at the housing position        S2, the side being opposite to the side having the latch 114 of        the front panel 32, when the small diameter portion 150 is        inserted to the holding member 164 to be held by the holding        member 164.

In the above-mentioned configurations, the front panel 32 moves betweenthe closing position S1 and the housing position S2 under a state wherethe lock member 144 is separated (released) from the holding member 164.The lock member 144 is pressed toward the inward panel width directionW2 by the pressing member 146 in the move of the front panel 32, theinward panel width direction W2 being opposite to a direction of theinsertion to the holding member 164, and thereby the lock member 144scarcely protrudes from the front panel 32 toward the outward panelwidth direction W1. As described above, the lock member 144 scarcelyprotrudes from the front panel 32 toward the outward panel widthdirection W1 in moving the front panel 32 between the closing positionS1 and the housing position S2. Accordingly, the lock member 144 can beprevented from hitting something (for example, the gas spring 137),thereby preventing the front panel 32 from being hard to be moved.

In addition, the latch 114 disposed on the front panel 32 is engaged tothe first striker 110 at the closing position S1, the first striker 110protruding downward, and is engaged to the second striker 112 at thehousing position S2, the second striker 112 protruding forward. Thus,movement (shake and vibration) of the front panel 32 can be suppressedat both of the closing position S1 and the housing position S2 in thepanel width direction W.

-   -   Meanwhile, the pressing member 146 is not necessarily limited to        a coil spring, and may be other spring members.

As shown in FIG. 8 an operation member 60 (an operation device 60) isdisposed inside the cabin 3. The operation member 60 is a device foroperating the devices provided on the skid steer loader 1. The operationmember 60 is disposed on a corner portion (an interior angle portion)between: the right frame portion 78 of the entrance frame 74; and asurface of the right side panel 31, the surface facing the operator seat8. For details, the right side panel 31 has a hollow 61 between theinner rim portion 43 of the front plate portion 40F and the right frameportion 78. The operation member 60 is attached to an attachment plate57, the attachment plate 57 being arranged in the hollow 61. In thismanner, the operation member 60 does not protrude to the inside of thecabin 3, and accordingly a space of the cabin 3 can be utilizedefficiently. Meanwhile, the operation member 60 may be disposed on acorner portion (an interior angle portion) between: the left frameportion 77; and a surface of the left side panel 31, the surfacepositioning on a side left to the operator seat 8.

The operation member 60 includes a plurality of switches. The switchesserve as switches for operating a plurality of devices included in theskid steer loader 1. The switches can operate, for example, a wiper, ahead lamp, and a cylinder lock. The switches are not limited to theabove-mentioned switches. The plurality of switches are arranged inparallel with each other along the vertical direction. In this manner,the operation member 60 has a vertically-long, and horizontally-shortshape, that is, a vertically-elongated shape, thereby being easilyhoused in the hollow 61.

The operation member 60 is disposed closer to a lower portion of thecabin 3, concretely, the operation member 60 is disposed under a half ofthe whole height of the cabin 3. In this manner, an operator can easilyaccess the operation member 60, sitting on the operator seat 8. Theoperator can operate the switches without hanging out of the operatorseat 8 accordingly, and thus the operation member 60 according to theembodiment provides good operability.

-   -   In addition, since the operation member 60 is disposed closer to        the lower portion of the cabin 3, a space can be easily created        closer to the upper portion of the cabin 3, the space being used        for arranging the above-mentioned members (the first striker        110, the bracket 111, and the support device 135) each for        opening the front panel 32.

Moreover, the operation member 60 is arranged to orient a surface of theoperation member 60 backward and diagonally-leftward, the surface havingthe above-mentioned switches. The surface having the switches is facedtoward an operator sitting on the operator seat 8, and thus theoperation member 60 according to the embodiment provides goodoperability. Meanwhile, considering a case where the operation member 60is disposed on the above-mentioned left corner portion between the leftframe portion 77 and the left side panel, the operation member 60 isdisposed orienting the surface backward and diagonally-rightward, thesurface having the switches.

-   -   Then, an air conditioner (not shown in the drawings) is disposed        inside the cabin 3, the air conditioner being configured to        condition the temperature in the cabin 3. As shown in FIG. 18        and FIG. 20, a circular (looped) rim 65 is formed on the outer        peripheral portion 40 of the side panel 31, the circular rim 65        forming an opening (an external air inlet) for taking an        external air to supply the taken air to the air conditioner. The        rim 65 is formed, on an upper portion of the outer peripheral        portion 40, closer to a rear portion of the side panel 31. For        details, the rim 65 is disposed on a rear portion of the upper        plate portion 40U of the outer peripheral portion 40. In other        words, the rim 65 is positioned above a portion between the        front wheel 5F and the rear wheel 5R of the skid steer loader 1.

Considering a case where the external air inlet of the air conditioner,that is, the rim 65 is disposed on or under a lower portion of the rearpanel of the cabin 3, the external air inlet tends to suck earth, sand,and dust when the air conditioner is in operation, the earth, sand, anddust being deposited on an engine hood (a bonnet) of the skid steerloader 1. In addition, considering a case where the external air inletis disposed on a side portion of the machine body 2, the external airinlet tends to suck earth and sand when the air conditioner is inoperation, the earth and sand being bounced by a running tire of theskid steer loader 1.

-   -   In contrast, according to the present invention, the external        air inlet is disposed, on the outer peripheral portion 40,        closer to the rear portion of the side panel 31. In this manner,        the external air inlet can be prevented from sucking: the earth,        sand, and dust deposited on the engine hood; or the earth and        sand bounced by the running tire, when the air conditioner is in        operation. However, in the scope of the present invention, a        position of the external air inlet (the rim 65) of the air        conditioner is not necessarily limited to the example shown in        the drawings. The external air inlet (the rim 65) may be        disposed on the outer peripheral portion 40 at a position        different from the example shown in the drawings.

A filter 66 is inserted to the external air inlet (the rim 65) of theair conditioner. In particular, a holding member 79 holds the filter 66by sandwiching the filter 66 at an upper surface and a lower surface ofthe filter 66. The holding member 79 is fitted to the rim 65 andinserted (embedded) into the external air inlet. The holding member 79has protruding portions 82, the protruding portions 82 protruding upwardor downward. A seal member 83 is attached to each of the protrudingportions 82.

-   -   As shown in FIG. 16 and FIG. 19, a cover 67 is disposed on an        external side (on a side opposite to the hollow (inside member)        61) of the filter 66. The cover 67 includes a louver portion 68        and attachment portions 69. The louver portion 68 covers the        filter 66 and has a plurality of air inlets (openings). The        attachment portions 69 are attached to the outer peripheral        portion 40, that is, to the upper plate portion 40U of the outer        peripheral portion 40. As shown in FIG. 17 and FIG. 19, the        louver portion 68 includes: a plurality of air inlets 80; and a        plurality of visor portions 81 each disposed on an outside (a        side opposite to the filter 66) of the corresponding air inlet        80, each of the visor portions 81 extending downward. In the        example shown in FIG. 17, the cover 67 has: the plurality of air        inlets 80 (four air inlets 80 in the drawing) arranged along the        front to rear direction (or the rear to front direction) at        predetermined intervals; and the plurality of air inlets 80        (three air inlets 80 in the drawing) arranged along the vertical        direction at predetermined intervals. Each of the plurality of        visor portions 81 is disposed on an outside of the corresponding        air inlet 80.

One of the attachment portions 69 extends forward and is disposed infront of the louver portions 68, and the other one of the attachmentportions 69 extends backward and is disposed in rear of the louverportions 68. Each of the attachment portions 69 has a through hole. Ashaft portion of a knob bolt 70 is inserted to the through hole, theshaft portion is screwed to a female screw hole disposed on the upperplate portion 40U of the outer peripheral portion 40 of the side panel31, and thereby the cover 67 is fixed to the outer peripheral portion 40in a freely attachable and detachable manner.

-   -   As shown in FIG. 16 and FIG. 19, a shield member 71 is fixed        externally on an outside of the louver portions 68 (on a side        opposite to the outer peripheral portion 40). The shield member        71 includes a plurality of plates 72 (three plates 72 in the        drawings) and a plurality of joint portions 73, the plates 72        extending along the front to rear direction (or the rear to        front direction) and being arranged (disposed) vertically at        predetermined intervals, the joint portions 73 each jointing the        plates 72.

As shown in FIG. 19, the plate 72 is disposed on the outside of thelouver portions 68 (on a side opposite to the filter 66) to form a spacebetween the louver portion 68 and the plate 72. Five of the jointportions 73 vertically extend and are arranged (disposed) along thefront to rear direction (or the rear to front direction) atpredetermined intervals. A fixation portion 84 is disposed on upper endsof the joint portions 73, the fixation portion 84 being fixed to thecover 67. The fixation portion 84 is fixed to an upper rim portion ofthe cover 67 by welding, and thereby the cover 67 and the shield member71 are integrally assembled.

Each of the plates 72 is arranged between the louver portions 68 beingvertically adjacent to each other. In particular, each of the plates 72is arranged between the visor portions 81 being vertically adjacent toeach other.

-   -   Since the louver portion 68 includes the visor portion 81        extending downward, the louver portion 68 provides a good        feature to block water coming from above (for example, rain        water) so as to prevent the water from reaching the filter 66,        However, the louver portion 68 does not provide sufficient        feature to block water coming from below. The plates 72 of the        shield member 71 are arranged between the louver portions 68        (specifically the visor portions 81) vertically adjacent to each        other, thereby being capable of blocking the water coming from        below. In this manner, considering a case where the water is        splashed from below toward the cabin 3 by a hose in washing the        skid steer loader 1, the water is prevented from entering into a        duct 44. Accordingly, the filter 66 can be prevented from        deteriorating, and the air conditioner can be prevented from        performance deterioration, the performance deterioration being        caused by the deterioration of the filter 66.

Meanwhile, as shown in FIG. 19 and FIG. 20, the air inlets 80 and thefilter 66 are communicated with the duct 44, the duct 44 being disposedon an inside of the side panel 31 (the inside facing the operator seat8). The outer peripheral portion 40 of the frame member 38 forms a partof the duct 44, the duct 44 being configured to take an external air tosupply the taken air to the air conditioner.

-   -   A configuration of the duct 44 will be described in detail        below.

The duct 44 is constituted of the outer peripheral portion 40 and aninside member 62. The inside member 62 is a member attached to an insideof the frame member 38 (the inside facing the operator seat 8). Theouter peripheral portion 40 of the frame member 38 is fixed to theinside member 62 by welding, and the outer peripheral portion 40 and theinside member 62 are integrally assembled.

-   -   The inside member 62 includes a first plate portion 63 and a        second plate portion 64.    -   The first plate portion 63 is a plate member opposite to the        upper plate portion 40U of the outer peripheral portion 40. The        first plate portion 63 is separated from the upper plate portion        40U toward the inside (inward), and the first plate portion 63        and the filter 66 are opposite to each other. A rear end of the        first plate portion 63 is fixed to the outer rim portion 42 of        the rear plate portion 40R. An upper end of the first plate        portion 63 is formed on a lower surface of the roof 30 or on the        outer rim portion 42 of the upper plate portion 40U.    -   The second plate portion 64 is opposite to the roof 30, is        connected to the first plate portion 63 at a side (an inner        side) of one end of the second plate portion 64, and is        connected at a side (an outer side) of the other end of the        second plate portion 64. For details, the second plate portion        64 extends toward the side panel 31 (the upper plate portion 40U        of the outer peripheral portion 40) and extends downward being        parallel to the side panel 31 (the upper plate portion 40U of        the outer peripheral portion 40). In this manner, the duct 44        for air passage is formed of the first plate portion 63, the        second plate portion 64, and the outer peripheral portion 40        (the upper plate portion 40U and the outer rim portion 42).    -   According to the above-mentioned configurations, the outer rim        portion 42 of the upper plate portion 40U constitutes an upper        wall of the duct 44, the upper plate portion 40U constitutes an        outer wall of the duct 44, the first plate portion 63 of the        inside member 62 constitutes an inner wall of the duct 44, and        the second plate portion 64 of the inner member 62 constitutes a        lower wall of the duct 44.

As described above, the outer peripheral portion 40 of the frame member38 of the side panel 31 is used for a part of the duct 44, and therebythe duct 44 can be formed only by attaching the inside member 62 to aninside of the outer peripheral portion 40. The duct 44 can be simplyformed of the small number of parts accordingly. In addition, the insidemember 62 is fixed to and integrally assembled to the outer peripheralportion 40, and thereby reinforcing the side panel 31 to improvestrength of the side panel 31, for example, bending strength.

-   -   Meanwhile, the inside member 62 may include a third plate        portion 85 and a fourth plate portion 86. The third plate        portion 85 is disposed between: a front end of the first plate        portion 63; and the upper plate portion 40U. The third plate        portion 85 is connected to the front end of the first plate        portion 63 at one end (an inner side) of the third plate portion        85, and is connected to the upper plate portion 40U at the other        end (an outer side) of the third plate portion 85.    -   The fourth plate portion 86 is a plate member being opposite to        the rear plate portion 40R of the outer peripheral portion 40        and to the upper plate portion 40U. In particular, one end (an        upper side) of the fourth plate portion 86 is opposite to the        upper plate portion 40U, and an intermediate portion of and the        other end (a lower side) of the fourth plate portion 86 are        opposite to the rear plate portion 40R. A rear end of the fourth        plate portion 86 is connected to the outer rim portion 42 of the        rear plate portion 40R. Or, the rear end of the fourth plate        portion 86 is disposed near (in the vicinity of) the outer rim        portion 42 of the rear plate portion 40R. In this manner, the        rear plate portion 40R, the outer rim portion 42 of the rear        plate portion 40R, and the fourth plate portion 86 can        constitute the duct 44 also on an inner side of the rear plate        portion 40R.

In the above description, the embodiment of the present invention hasbeen explained. However, all the features of the embodiment disclosed inthis application should be considered just as examples, and theembodiment does not restrict the present invention accordingly. A scopeof the present invention is shown not in the above-described embodimentbut in claims, and is intended to include all modifications within andequivalent to a scope of the claims.

What is claimed is:
 1. A cabin comprising: a panel disposed on a side ofan operator seat; an outer peripheral portion disposed in the panel, theouter peripheral portion including: a rim forming an opening; a firstplate portion facing the outer peripheral portion on a side of thepanel, the side being an identical side to the operator seat, a secondplate portion connected to the first plate portion and connected to theouter peripheral portion; and a duct formed of the outer peripheralportion and the plate portion, the duct being communicated with theopening.
 2. The cabin according to claim 1, wherein the outer peripheralportion includes: an upper plate portion constituting an upper portionof the panel, and the rim is disposed in the upper plate portion.
 3. Thecabin according to claim 1, comprising: a filter inserted to the rim;and a cover includes: a plurality of louver portions each having an airinlet, the cover covering the filter.
 4. The cabin according to claim 3,comprising: a shield member disposed on a side of the louver portion,the side being opposite to the outer peripheral portion.
 5. The cabinaccording to claim 4, wherein the shield member includes: a plurality ofplates extending in a first direction; joint portions each jointing theplates.
 6. The cabin according to claim 5, wherein the plates aredisposed between the louver portions.
 7. The cabin according to claim 6,wherein the shield member includes: a fixation member configured to befixed to the cover.
 8. A working machine comprising: the cabin accordingto claim 1; an operation device including: a boom configured to freelyswing upward and downward; and an operation tool supported on a frontportions of the boom; and a travel device.